How does the structure of fatty acids compare to the basic units found in other macromolecules

Macromolecules like proteins have a repeating unit of amino acids, polynucleotides have repeats of nucleotide, polysaccharides have repeats of simple sugar like glucose, similarly lipids have a repeating units of fatty acids and alcohol (like glycerol).  

Explanation:

Many lipids have both glycerol and fatty acids. For example:

Simple lipids: These are esters of fatty acids and various alcohols. A fatty acid molecule is an unbranched chain of carbon atoms having a carboxylic group attached to an R group. The R group could be a methyl group, ethyl group, or higher number of groups. Like, palmitic acid has 16 carbons including carboxyl carbon. Fatty acids can be either saturated or unsaturated. Saturated fatty acids are without double bond. Example: palmitic acid and stearic acid. Unsaturated fatty acids are with one or more double bonds. Example: Oleic acid, linoleic acid, linolenic acid, arachidonic acid.

Waxes: waxes are esters of fatty acids with alcohol of high molecular weight instead of glycerol. Example: bee wax, lanolin, etc. They have an important role in protection.  

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the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy